Why Do We Still Have "Exceptions"..?
I was reading Shane's post (well, I had more interaction with his problem than just reading his post since we sit next to each other!) and it made me realise... why do we still have exceptions!?
I mean, in this age of pre-washed salad, skinned and de-boned fish portions, and the Interweb, why is the ancient and painful (I think of handling exceptions akin to that dude from the Da Vinci Code tightening his little leg chain thingy) practice of having to "handle" exceptions still part of a developers life?
Now, before you put a hole through your mouse button in your frenzied attempt to leave a comment, allow me to explain.
The basic idea of any exception is that something has occurred in your application that was unexpected (such as Jesus' likeness appearing in your comment block), and cannot be handled in an appropriate way by your application, through to the platform/runtime.
Typical things cause exceptions like dividing by zero, buffer overruns, accessing an uninstantiated variable, the list goes on. But what amazes me is that when these things occur, the only thing the OS (because it is the OS providing the lowest level of runtime services) can do is evacuate its bowels.
So I was thinking, why isn't there some mechanism within the OS that is capable of handling exceptions at the last point before the inevitable user (and eventually developer) chastisement? I'm thinking next time your application spits the dummy, instead of some nondescript box popping up, why doesn't the OS (or runtime) simply say, "The application is currently in this state, for example, trying to access object X of type Y which is null, so I'll "rewind" myself to the last section/procedure/method that was working, and let the developer (don't tell the user, they don't care and aren't in a position to do anything other than be frustrated) know what happened by sending them an email (come on, email is everywhere!). And to the user, just tell them that the program stuffed up and is resetting itself back to a previous point, and that until the developer fixes the bug, they probably shouldn't return to that feature/function.
Anyway, don't get too bogged down in my example, but rather think to yourself, as developers, we do a lot of repeatable crap (ala having to deal with exception after the fact) that has been done the same way since the dawn of time, and until we protest, we will continue to do it! Think about evolution... nothing evolves unless it's pushed to. OS's and Runtime's won't evolve out of the lazy "eh, something happened in your app, good bye" to something way cooler. WAY COOLER!